Those things have a Ford ECU in them to begin with. I'd do a Focus ECU swap, tune on that. If it's like the Protege, you need to do a simple repin of a couple of the wires and then it's on.
not from what i recall the focus/mazda electronics are much different there both duratec 2.0/2.3 and share the same motor but if the electronics were the same it wouldnt be nearly as hard to find a 2.3 swap for the focus and the mazdaspeed3 swap would get considered.
I know cobb makes a tuner for the mazda havent used it personally but a buddy with a ms3 said it sucks so idk if he just doesnt know how to use it or if it actually sucks.
other info
most i have seen with my own eyes was 220wheel on a stock motor
the plastic intake manifold also wont like more than 12psi i know we used a cosworth on a focus not sure how or if it would work on a mazda.
supertech makes good pistons and eagle makes sweet rods. be gentle re torqing the cams when it goes back together they are fragile and will snap if your not smooth. also good idea to ditch the balance shafts
there easy enough to remove when you drop the pan just cut the chain un bolt them and make a plug to plug the oil hole.
if you get cams there a bit of a bitch to lash and you need to buy a lot of different thickness buckets
charge piping also sucks ass on duratec cars.
sorry for the dead thread revamp just tossing out info